Die for making bit-stock tools



E. T. McPHERSON.-

DIE FOR MAKING BIT STOCK TOOLS.

APPL1CATION FILED JUNE 4. 1919.

1,366,815. Patented Jan. 25,1921.

' ,2SHEETSSHEET 1.

fiifqefi ma. I: ,2: 1 v zs I 26 J2 T U i 5 54 l I I E. T. McPHERSON.

DIE FOR MAKING BIT STOCK TOOLS.

APPLICATION FILED JUNE 4, 1919.

Patented Jan. 25,1921.

2 SHEETS-SHEET 2.

UNlTED STATES earne orrice.

ELI/ ER T. MCPHEBSON, OF W'ALLINGFOED, CONNECTICUT.

DIE FOR HEARING BET-STOCK TOOLS.

Application filed June 4,

To all 10 ham it may concern Be it known that I, ELMER T. ll lclnnnson, a citizen oi the United States, residing at li allingtord, in the county of New Haven and State of Connecticut,'have invented a new and useful Improvement in Dies for ivl aking Bit-Stock Tools; and I do hereby declare the following, when taken in con nection with the accompanying drawings and the characters of reference marked thereon. to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, iii- Figure l a plan view of the lower die of my improved dies, showing also the beveled lower end or toe of the independent gage adjustably mounted upon the trip-hammer in which the dies are installed.

Fig. 2 an end view of the said die, also showing the gage as broken away.

Fig. 3 a reverse plan view of the upper die.

g. a a leithand end view thereof. Fig. 5 a right hand end view thereof. Fig. 6 a front view of the two dies, placed one upon the other.

Fig. 7 an end view showing the two dies placed one upon the other with the adjustable gage in position between their forward edges.

Fig. 8 a broken perspective view of a blank.

Fig. 9 a similar view of the blank after its square, tapered shank) and its round stein have been blocked out.

Fig. 10 a similar view alter the round stem has been finished.

Fig. 11 a similar view after the square tapered shank has been finally shaped.

My invention relates to an improvement in dies used in the manufacture of auger bits, expansion bits, drills, reamers, screw drivers, and other kindred tools designed to be used in bit-stocks, the object being to produce tools of superior finish and uniformity as to size.

With these ends in view, my invention consists in dies having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, I employ a lower die 2 and an upper die 8, these dies being installed in the usual Specification of Letters Patent.

Patented Jan. 25, 1921.

1919. Serial No. 301,648.

nanner in a trip-hammer. The lower die is formed at its left hand end with a forwardly and upwardly inclined flat forging surface which, for convenience, I shall hereafter refer to as the blocking-surface for the reason that its function is to roughly block out the square tapered shank 5 (Fig. $1) from the end of the blank 6 (Fig. 8). T he inner edge of the blocking-surface l is separated by a slightly raised transverse shoulder 7 from a level blocking surface 8 lying directly bacle the surface at and rornied with two shallow parallel curved blocking-grooves S) intersecting the said shoulder and serving to block or rough out that portion of the round stem 10 of the tool adjacent to its square tapered shank 5 as shown in Fig. 9. It will be understood that the grooves 9 do not shape the stem into round form, but they do break down the square corners oi the initial'blank as the blank is rocked by the operator over the ridge ll. forming a part of the surface 8 and located between the shallow grooves 9.

lhe outer edge of the blocking-surface l is flanked by the overhanging beveled too 12 of a gage 13 formed with an arm 1% having a slot 3 receiving bolts l6 by means of which the gage is adjustably secured to some part of the frame of the trip-hammer. The toe 1:2 has the three-fold function or gaging the position of the blank as it is placed upon the lower die, oi forcing any excess of metal rearward and of producing upon the end of the square tapered shank 53 the symmetrical faceted tip 1.? which is characteristic of the product. T he transverseshoulder '7 already described. serves to develop the shoulder 17 between the square tapered bit-shank and the round stem 10.

The upper die similarly formed with a beveled blocking surface 20 corresponding to the blocking surface i and with a level blocking SLUfTitWQ 21 corresponding to the level blocking surface 8, the surfaces 20 and 21 being separated by a slightly raised transverse shoulder 22, and the level surface 2i being formed with shallow forging grooves corresponding to the grooves 9, 9, and separated by a rib 2% corresponding to the rib 11. I may say here that the grooves 9, 9, and 23, are not essential, but they facilitate the operator in positioning the blank as he rocks it by quarter turns between the upper and lower dies. The described rocking of the blank is, of course, timed in accordance with the speed of the tripham mer.

After the blank has been roughed out into the form in which it is shown in Fig. 8, which perhaps represents it as somewhat more symmetrical than it will be in actual practice, it is shifted into a semicircular forging groove 25, formed in the lower die and corresponding in curvature to the round stem 26 of the tool, this forging groove 25 having a throat or guideway 27 at its rear end and intersecting at its forward end a deep clearance recess 28. The upper die is correspondingly formed with a semi-circular forging groove 29 corresponding to the groove 25, having a throat O corresponding to the throat 2'7, and a recess 31 corresponding to the groove 28. lVhen the partly developed blank (Fig. 9) is subjected to the action of the forging grooves 25 and 29 and turned therein, it assumes the form in which it is shown in Fig. 10, the square tapered bit-shank 5 being the same as shown in Fig. 9, but the round stem 26 being new fully developed.

I From the forging grooves and 29, the blank is shifted to an inclined finishing surface 32 corresponding in pitch to the taper of the finished square tapered shank as shown in Fig. 11, the upper die having a corresponding inclined finishing surface The surfaces 32and 34: not only finish the square tapered shank 33 but also shape the rudimentary shoulder 18 of Fig. 9 into the perfected shoulder of Fig. 11.

By means of my improved dies the square tapered shanks and round stems of tools for bit-stocks may be produced rapidly and with a degree of uniformity not possible with. the dies heretofore employed. The bit-shanks are also formed with symmetrically faceted tips which give a finish to the completed articles. 7

I claim 1. A. die for simultaneously forging the square shanks and round stems of bit-stock tools, the said die having an upwardly and forwardly inclined fiat blockingsurface upon which the blank is free to rock by quarter turns, an adjustable gage located at the forward edge of the said blockingsurface, a level blocking-surface located at the rear edge of the said inclined blockingsurface, and a forming-shoulder separating the said inclined and level blocking-surfaces and producing the customary shoulder between the square shanks and round stems of such tools.

2. A die for simultaneously forging the square shanks and round stems of bit-stock tools, the said die having an upwardly and forwardly inclined flat blocking-surface upon which the blank is free to rock by quarter turns, an adjustable, beveled gage located at the forward edge of the said inclined blocking-surface, a level blocking surface located at the rear edge thereof, and a transversely arranged, raised formingshoulder interposed between the said inclined and level blocking-surfaces and producing the customary shoulder between the square shanks and rounded stems of such tools.

3. A die for simultaneously forging the square shanks and round stems of bit-stock tools, the said die having an upwardly and forwardly inclined flat blocking-surface upon which the blank is free to rock by quarter turns, an adjustable gage located at the forward edge of the said inclined blocking surface, a level blocking-surface at the rear edge thereof, parallel grooves locatedin the said level blocking-surface, and a transversely arranged forming-shoulder inter posed between the said inclined and level blocking-surfaces and intersected by the forward ends of the said grooves.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

I ELMER T. MGPHERSON.

CLARA L. WEED. 

